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CVE-2026-72083

Vulnérabilité critique dans Linux (Linux)

CVSS 9.8 · Critique
EPSS 0.7%
Linux•Linux•Versions : <=6.1.*, 7.1.5, 6.18.40, <=6.12.*, <ef2ee18fec92088c7d8877baf7674e89389ccd66, <59a2a5a37dc49a641ad6bc64aee34e5a61025ffd, 0, <a040004846f1fbe687f6ec76d9ccc27b4ead42e4, <=7.1.*, <cb7bdae7fba404852ade34b0c1445fbaf3e54fbb, <3.3, 6.1.178, <=5.10.*, <=6.6.*, 6.12.97, <7d56f5c868d92c9d504a34a3ea450bce481c7f63, 4949314c7283ea4f9ade182ca599583b89f7edd6, d2227f84ba0e97906153ac83db13213fb2e3938d, <9f8076cc73dfa6b10155978c160587e986b22169, <fda6a1f3c3d7047b5ce5654487649c2daa738bfc, <=6.18.*, 3.3, 5.15.212, 6.6.145, 5.10.261, <=*, <=5.15.*, <05b3e37433cf2eaf8867f1c16528aa347bb212ab, 3.2.9, 7.2

Description

In the Linux kernel, the following vulnerability has been resolved: scsi: target: core: Fix iSCSI ISID use-after-free in REGISTER AND MOVE core_scsi3_emulate_pro_register_and_move() maps the PERSISTENT RESERVE OUT parameter list with transport_kmap_data_sg() and parses the destination TransportID with target_parse_pr_out_transport_id(). For an iSCSI TransportID (FORMAT CODE 01b), iscsi_parse_pr_out_transport_id() returns the ISID in iport_ptr as a raw pointer into that mapped buffer. The function then unmaps the buffer with transport_kunmap_data_sg() before dereferencing iport_ptr in strcmp(), __core_scsi3_locate_pr_reg() and core_scsi3_alloc_registration(). When the parameter list spans more than one page (PARAMETER LIST LENGTH > 4096), transport_kmap_data_sg() uses vmap() and transport_kunmap_data_sg() does vunmap(), so the kernel virtual address backing iport_ptr is torn down and every subsequent dereference is a use-after-free read of the unmapped region. Keep the parameter list mapped until iport_ptr is no longer needed: drop the early transport_kunmap_data_sg() and unmap once on the success path, right before returning. The error paths already unmap through the existing "if (buf) transport_kunmap_data_sg(cmd)" at the out: label, which now runs on every post-map error exit because buf is no longer cleared early. Only reads of the mapping happen while spinlocks are held; the map and unmap calls remain outside any lock. The sibling caller core_scsi3_decode_spec_i_port() already uses the buffer before unmapping it and is left unchanged.

Gravité et risque d'exploitation

CVE-2026-72083 obtient un score CVSS de 9.8/10, soit une gravité critique. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.72 %, ce qui la place devant 53.2 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, 7.1.5, 6.18.40, <=6.12.*, <ef2ee18fec92088c7d8877baf7674e89389ccd66, <59a2a5a37dc49a641ad6bc64aee34e5a61025ffd, 0, <a040004846f1fbe687f6ec76d9ccc27b4ead42e4, <=7.1.*, <cb7bdae7fba404852ade34b0c1445fbaf3e54fbb, <3.3, 6.1.178, <=5.10.*, <=6.6.*, 6.12.97, <7d56f5c868d92c9d504a34a3ea450bce481c7f63, 4949314c7283ea4f9ade182ca599583b89f7edd6, d2227f84ba0e97906153ac83db13213fb2e3938d, <9f8076cc73dfa6b10155978c160587e986b22169, <fda6a1f3c3d7047b5ce5654487649c2daa738bfc, <=6.18.*, 3.3, 5.15.212, 6.6.145, 5.10.261, <=*, <=5.15.*, <05b3e37433cf2eaf8867f1c16528aa347bb212ab, 3.2.9, 7.2) est présent sur votre parc.
  • Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
  • À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
  • Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

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